Boiler



UNITED sTATEs PATENT oEErcE.

O. S. CAMP, OF FAIRFIELD, IOWA.

BOILER.

Specification of Letters Patent No. 24,442, dated June 21, 1859.

To all whom 'it may concern:

Be it known that I, O. S. CAMP, of Fairfield, in the county of Jefferson and State of Iowa, have invented certain new and useful Improvements in Boilers; and I do hereby declare that the following is a full, clear, and exact description of the const-ruction and operation of the same, reference being had to the accompanying drawings, in which- Figure l, represents a perspective view of said boiler. Fig. 2, represents a longitudinal vertical section through the same.

To enable others skilled in the art to make and use my invention I will proceed to describe its construction and operation.

The boiler represented in the drawings is made with double sides or wallsA, and B, one within and equidistant from the other, the bottom C, as well as the cover D, is common to both. The space between the two boilers may be dead air space, or be partially filled with water or steam for a purpose to be hereafter described. The inner boiler B, is furnished near its upper edge with openings a., c, from which the closed spaces Z), lead downinto the space between the two boilers, so that if the space between the double walls of the boiler be used as air space and steam be passing through it, the steam shall enter low down, and then 'rise and pass through said space, or if the space be filled with water so that the steam shall enter the water low down, and thus more uniformly heat it up, as it comes in contact wit-h a greater body of water. In either case the inner wall of the boiler has a heated medium on its outer side which will not convey off its heat as rapidly as the air would do, when used without the outer wall. It is thus a great saver of heat, as it loses little or none by conduction through the metal, there being a non-conducting medium between the inner and outer walls.

D, is the cover common to both boilers, the latter being provided with two concentric flanges o, and (l, which fit against their respective sides A, and B, when the boiler is covered.

L, represents two hinged clamps for the purpose of holding down the cover D, and E, represents the handles of the boiler,

I make the entire boiler of the metal known as galvanized iron, as the same is lnore economical, durable, and less affected by alkali, acids, and by the fire than tin or copper.

In using this boiler the articles to be boiled together with the requisite quantity of water are put into the inner boiler B, the space between the inner and outer boiler being air space, or partially or entirely lled with water. The water in the inner boiler is heated by the common process of boiling while the air or water in the outer space is heated by steam arising from the boiling water of the inner boiler, which passes through the holes cz, and down the ilues b, and throughle, into the water of outer boiler. The inner boiler is thus surrounded by another boiler of the same temperature which is a non-conductor of heat, and prevents the inner boiler from cooling by conduction through its walls, and thus said boiler if once heated, will require but a small quantity oiI fuel to keep it at the same temperature. The cover D, must be fitted well to the inner boiler to prevent an easy escape of the steam, and should the pressure of the steam become too high it will escape through the pipe F, which opens inward into the outer boiler. Thus it will be seen that there will be economy in fuel in using this double boiler, as compared with a boiler of the common construction, and a further saving will be effected by making the same of galvanized iron as above described, as it is cheaper and more durable than the other sheet metals used for this purpose.

Having thus described my invention, what I claim is- A boiler made of double walls, and a single top and bottom, said top having flanges to fitagainst each wall, and the communication between the interior of the' inner boiler, and the space between the walls, being made by closed passages, such as de* scribed, the whole being constructed as set forth, and for the purpose described.

O. S. CAMP.

Witnesses:

S. M. BRADLEY, THos. D. EVANS. 

